Thailand's 84-year-old King Bhumibol Adulyadej, the world's longest-reigning monarch, experienced health problems overnight including bleeding in the brain but his heartbeat and blood pressure were now normal, an official statement said on Friday. The Bureau of the Royal Household said that on Thursday night the king had experienced intermittent twitching of his right hand and his heartbeat had increased slightly. The palace said a trip out of Bangkok scheduled for Sunday had been cancelled.